The Natural History Museum is a New York-based organization that provides online and mobile programming, and exhibits intended to “affirm the truth of science” and call attention to the “political /funding climate” in the science museum community. It has no multimillion-dollar signature building, expensive exhibits with benefactors’ names next to them on gold plaques or an admission price that will set a family back $100. But it’s taking aim at those science and natural history museums that do, questioning the integrity of accepting funding from donors with an interest in and history of refuting scientific research on issues like climate change—donors like the Koch Brothers of the fossil fuel-driven Koch Industries.

The group has issued an open letter to these museums from members of the scientific community, urging them to cut such ties.